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Old 09-26-2022, 04:28 PM #16
4runnerJim 4runnerJim is offline
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4runnerJim 4runnerJim is offline
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Quote:
Originally Posted by lord rigatoni View Post
hey y’all so my 3rd gen has been having this weird intermittent misfire, but it only happens after the engine has been warmed to operating temperature, shut off, and restarted. after started, the typical misfire symptoms: rpms drop, car shakes pretty bad, bucks and hesitates when trying to accelerate. heres what i have checked so far:

- checked all 6 spark plugs, all work fine, no soot or discoloration
- tested wires and ignition coils, resistance in all 3 coils are good
- checked and cleaned the throttle body
- cleaned MAF sensor
- checked compression, each cylinder was good with 1-2 psi difference between each cylinder
- checked all hoses, no leaks

i have not checked the fuel injectors yet since i have not had much time to get under the hood and remove them. my guess is that it is an injector that is either not working properly or possibly a bad ground but i’d like to know what you guys think. what has me thrown for a loop is the manner in which the misfire happens. when the engine is cold started, it cranks a couple times, starts smooth and runs perfectly fine, drive for about 20-30 min, shut the engine off, come back after a half hour or so, start the engine and boom, misfire mania. i cleared the codes, so the CEL doesnt come on when it happens but the codes are:

P0300: random cylinder misfire
P0301: cylinder 1 misfire
P0304: cylinder 4 misfire

tomorrow i will have some free time so i will pull the injectors, test them and see if that is the culprit.

what did you find out? my 2011 has the same issue, starts up fine and runs great for a short while. then if will misfire. 302 and 306 code. oddly enough, once its misfiring, i can turn the truck off and restart it and it runs fine. then the misfire reappears minutes later. i can just keep on "resolving" the misfire by restarting.

you solve your issue?
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Old 09-27-2022, 10:26 AM #17
Bad Luck Bad Luck is offline
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Quote:
Originally Posted by 4runnerJim View Post
what did you find out? my 2011 has the same issue, starts up fine and runs great for a short while. then if will misfire. 302 and 306 code. oddly enough, once its misfiring, i can turn the truck off and restart it and it runs fine. then the misfire reappears minutes later. i can just keep on "resolving" the misfire by restarting.

you solve your issue?
Since you have a 2011 you have a 5th gen. You would have much better luck finding your answer in the 5th gen section: https://www.toyota-4runner.org/5th-gen-t4rs/ or searching for your problem with this 5th gen specific google search: site:toyota-4Runner.org/https://www.toyota-4runner.org/5th-gen-t4rs/ - Google Search
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